Pulsed neutron sources are useful for imaging since they give different information compared with steady reactor sources [1,2]. At the pulsed neutron source, we can easily use the time-of-flight method to analyze the neutron energy and it enables us to obtain position dependent transmission data as a function of energy with high energy resolution. The transmission spectrum is affected by...
Over the past few years, several wavelength-dependent neutron imaging capabilities have been developed at spallation neutron sources such as RADEN at J-PARC and IMAT at ISIS. At the Spallation Neutron Source of Oak Ridge National Laboratory, wavelength-dependent experiments are ongoing, and a temporary imaging capability is being planned at the Spallation Neutrons and Pressure Diffractometer...
The ‘IMAT’ instrument, which specializes in Imaging and MATerials science, is now well into its commissioning phase. The basic performance parameters for white-beam tomography and energy-dispersive neutron imaging have been determined [ 1 ] and the instrument is currently being prepared for user operation [ 2 ]. Here we report on the evaluation of the wavelength-resolving imaging options on...
The world’s first pulsed neutron imaging instrument dedicated to energy-resolved neutron imaging experiments, named RADEN, was constructed at beam port 22 in the Materials and Life Science Experimental Facility (MLF) of J-PARC [1]. This instrument is designed to conduct state-of-the-art energy-resolved neutron imaging, such as Bragg-edge imaging, resonance absorption imaging, and pulsed...
Novel scintillation screen with significantly improved radiation hardness and very high light output
Bernhard Walfort1, Christian Grünzweig2, Pavel Trtik2, Manuel Morgano2, Markus Strobl2
1 RC Tritec AG, Speicherstrasse 60 a, CH-9053 Teufen, Switzerland, walfort@rctritec.com
2 Paul Scherrer Institut, Laboratory for Neutron Scattering and Imaging (LNS), WBBA 108, CH-5232 Villigen,...
This work is focused on the development of energy-selective techniques using a compact Deuterium-Deuterium (D-D) fast neutron generator. This was done in the context of a custom D-D generator located at the Paul Scherrer Institute which was specifically developed to have a small emitting spot size for transmission imaging purposes [1]. The basis of this study lies in the physics of the D-D...
Neutron imaging systems have been designed and constructed by Phoenix LLC to investigate low density material attributes of composites and other materials where other Non-destructive evaluation, (NDE), methods do not suffice. The first-generation electronic neutron generator was commissioned in 2013 at a United States Army research facility to inspect munitions and other critical defense and...
It has long been recognized that neutrons can compliment x-rays for imaging. This is due to their very different attenuation characteristics based on nuclear cross-section, which allows imaging of low Z materials through higher Z materials. Additionally one can use energy dependent Time of Flight (ToF) imaging to exploit phenomenon like nuclear resonances for isotope and element specific...
It is recognized that Bragg-edge neutron transmission method can deduce crystal structure, crystalline phase, crystallographic texture, crystallite size (from the primary extinction effect) and macro-strain in the imaging mode. In this study, further material information, micro-strain, dislocation density and crystallite size, were deduced by broadening analysis of multiple Bragg-edges.
So...
A model describing the connection between time, spatial, wavelength and contrast resolution was presented at ITMNR-8 in 2016 [1]. Resolution limits caused by the sample contrast were derived from the model. The resolution of neutron imaging measurements is limited by practically available illumination time. The time needed for radiography and tomography measurements depends on the fifth and...
Nuclear energy technologies are used to produce a significant portion of the world’s electricity, and this will continue to be true as numerous countries build or expand their nuclear power plant fleets. The continued use and growth of nuclear energy globally, however, faces significant materials science and engineering challenges. These include the development of advanced nuclear fuel...
Lithium batteries are considered one of the most transformative technologies of the 20th century. They are a reliable power source for portable devices which are used every day by billions of users, such as mobile phones, laptops, pacemakers and increasingly in electrical vehicles. Lithium batteries have high energy density and capacity, superior reliability and long shelf life of up to 20...
There is usually a long delay between the discovery of novel single crystal materials and their use in practical applications. The new materials are often characterized with a small synthesized grain, while many applications require relatively large crystals (e.g. large enough to absorb gamma photons in case of gamma detectors). Introduction of new single crystal materials is often limited by...
Neutron radiography is a non-destructive technique extensively used in the investigation of materials. The integrity of the investigation depends in part on the quality of the radiographic image produced by a neutron radiography system. A neutron collimator is one of the components that contribute to the quality of radiograph. Optimization of a neutron collimator entails finding the balance...
The High Flux Isotope Reactor (HFIR) CG-1D neutron imaging facility accommodates a broad range of research applications such as materials science, engineering, energy, physics, biology and plant physiology. This instrument is equipped with a modern data acquisition system that helps users to acquire data in a semi-automated fashion. Until now, raw data were processed using MatLab and/or...
It is well-known that a neutron imaging experiment is not finished with the acquisition of the data, but merely is the starting point for data processing and evaluation in order and to extract the information that is needed to draw conclusions about the sample or the observed process. This can be very time consuming depending on the amount of data and complexity of the information it contains...
The first coins were made of electrum and were minted during the 7th century BC in Lydia (Asia Minor). Plated electrum coins began to appear soon after, and these have usually been identified as privately manufactured 'fakes'. But it is possible that they were in fact produced in the state's own mint. The art of plating coins required a very high skill level. Attaching a thin piece of...
Urbanization and increasing sealing of the landscape by impervious surfaces lead to fast water runoff in the cities. In urban areas, rain water is often channeled towards swales where it is left to infiltrate through recently engineered soil. As the runoff water is prone to carrying dissolved and colloidal contaminants, it is important to investigate the water infiltration process through soil...
Water spontaneous imbibition in unsaturated fractured rocks is a ubiquitous phenomenon in nature and engineering such as the enhanced oil recovery by water flooding, the storage of hazardous wastes underground and the development of geothermal et al. In the presented work, direct visualization of water imbibition in a vertical smooth-walled fracture with a width of ~114 μm within a low...
Neutron Imaging used to be a non-destructive testing (NDT) tool for decades and as such was listed with a few techniques in the ASTM standards. However, for the current state-of-the art in neutron imaging such NDT terminology, which mostly still refers to film detection, appears outdated in light of the digital imaging at advanced, large-scale neutron source facilities. We note that these...
The speed of thermal/cold neutron radiography is limited by the available flux even on the strongest spallation sources. The flux limitation can be alleviated using phase-lock, ensemble averaging techniques for periodic, repeating processes as it has been demonstrated on several samples like engines, pumps etc. However capturing rapid, transient, non-periodic processes by neutron imaging...
INTRODUCTION
The characterization of localized deformations and its effects on the permeability of rocks is fundamental to a number of resource engineering challenges, e.g., hydrocarbon and water production and $CO_2$ sequestration. However, the complexity of performing conclusive experimental campaigns to analyze the hydro-mechanical behavior of porous subsurface rocks leads to...
An understanding of hydrogen diffusion in nominally anhydrous minerals (NAMs) is an essential context of correct interpretation of conductivity dissimilarity in Earth mantle. The mechanism of hydrogen diffusion in dominant mantle minerals was described by Demouchy (2010) and Demouchy and Casanova (2016) using a defect model in crystalline materials. This concept is well-known and well...
The material characterization by neutron imaging reached a new level after developing innovative techniques using different contrast mechanisms than the common beam attenuation. In this way properties of materials and complex systems can be resolved by position sensitive mapping of diffraction, small-angle scattering and refraction signals. In addition the improved spatial and time resolution...
Introduction
We will describe three proven applications of 1-inch CCD cameras to neutron and x-ray imaging, as recently provided for Indonesia, Thailand & Malaysia. The 1-inch ICX694ALG is Sony's largest CCD, with high efficiency and exceptionally low noise.
250x200 mm neutron/x-ray imaging camera
Our ICX694ALG camera can be...
Pelycosaurs are the most primitive members of the Synapsida, which is the clade that includes mammals. Consequently, pelycosaurs are of special interest with respect to our early evolution. We investigated a skull of Varanosaurus acustirostris for the first time by means of neutron tomography at the facility ANTARES at FRM II in Munich. Varanosaurus acustirostris was a representative of the...
The physical extraction of fossilised remains from rocks enables quantitative physiological investigation of bone-dimensions, volume, and porosity, however leads to the destruction of valuable contextual information and soft-tissue remains within the matrix.
Conventional and synchrotron-based X-ray computed tomography (XCT) have been utilised for many years as critical tools in uncovering...
At the FRM II reactor in Garching, Germany the Heinz Maier-Leibnitz Zentrum operates the two neutron imaging facilities ANTARES and NECTAR. ANTARES provides a cold neutron spectrum which gives high sensitivity for even small changes of composition in a sample. Consequently ANTARES is used for neutron imaging with high spatial resolution as well as novel techniques such as imaging with...
The Dolese Brothers Limestone Quarry, near Richards Spur, Oklahoma, USA, preserves an Early Permian (298 million years old) infill in a series of Ordovician limestone and dolostone karst fissures. Speleothems intimately associated with the site indicate that Richards Spur is a cave system, suggesting a unique preservational environment for vertebrates, one that is distinct from those of more...
Fast-neutron imaging (FNR) is a nondestructive testing technology using fast neutrons as probes. The key problem of improving the quality of fast-neutron imaging is developing a suitable detector, which can convert the invisible fast-neutron image into a visible light image effectively and distinguishably.
The researchers in Institute of Nuclear Physics and Chemistry(INPC)of Chinese Academy...
Most neutron imaging systems can accommodate large samples of 15 -30 cm size, but recent interest is more focused on small cm-sized samples. With a small field of view for a camera-based detection system, the neutron flux per pixel decreases, and measurement time increases.
There were approaches to split a large field of view into smaller fields for individual CT measurements using a...
The hygroscopicity of wood influences wooden musical instruments in various ways. On the one hand, the moisture content (MC) affects mechanical and acoustical properties via density, stiffness and damping. On the other hand, changes in MC result in swelling and shrinkage. Moreover, spatial MC gradients can lead to high internal stresses, which may result in cracks and fracture.
Varnishes act...
Metal artefacts excavated from archaeological sites are often heterogeneous not only in their stylistic features but also in structure and composition. This is ultimately related to a variety of manufacturing processes developed within different socio-technological contexts. The current paper demonstrates how heterogeneous structures and underlying manufacturing techniques can be successfully...
The value added by neutron beam line facilities through research of is evident from the number of new facilities planned and commissioned worldwide. In order to provide local and international researchers with world-class capabilities, Necsa embarked on the upgrade of the neutron beam line instruments at the SAFARI-1 nuclear research reactor, which entails inter alia a complete functional...
Japanese swords are interesting cultural heritage from metallurgical point of view due to its peculiar characteristics. Its making process is not fully understood even now. Crystallographic information will be useful to understand metallurgical characteristics and to know making process. Non-destructive analysis is desired to obtain the crystallographic information for such valuable samples....
ODIN (Optical and Diffraction Imaging with Neutrons) is a beamline project at the European Spallation Source (ESS). It is a collaboration between the ESS, the Paul Scherrer Institut (PSI) in Switzerland and the Technical University Munich (TUM) in Germany, with TUM as lead institution.
ODIN will provide a multi-purpose imaging capability with spatial resolutions down to the µm range. The...
Scientific investigations and archaeometric studies have played a major role in the field of archaeology, especially with regard to materials transformed through human activity, like metals. Metals are generally investigated through metallography and Scanning Electron Microscopy (SEM), which required sampling or surface preparation. Neutron techniques instead are able to provide the bulk...
MODERN FACILITY FOR NEUTRON RADIOGRAPHY AND TOMOGRAPHY FOR APPLIED RESEARCH ON THE BASE OF THE VVR-K REACTOR
B. Mukhametuly1,2,3, Y.А. Kenzhin2, А.А. Shaymerdenov2, К. Nazarov3,
1Al-Farabi Kazakh National University, Almaty
2Institute of Nuclear Physics, Almaty
3Joint Institute for Nuclear Research, Dubna
email: bagdaulet.mukhametuly@gmail.com
At the basin-type reactor on thermal neutrons...
A strategic scientific research project Cultural Heritage has been initiated at the Australian Nuclear Science and Technology Organisation (ANSTO). The project aims to promote the access to the suite of nuclear methods available across the organisation, and the use of a non-invasive analytical approach in the field of cultural-heritage, archaeology, and conservation science. The latest...
NeXT-Grenoble is the Neutron and X-ray Tomograph born in 2016 from the joint effort of Universitè Grenoble Alpes (UGA) and the Institut Laue-Langevin (ILL), and takes advantage of its world-leading cold neutron flux. Specifically, the flux peaks at $3x10^8n~cm^{-2}~s^{-1}$ for an L/D of 333 with an average wavelength above 3 Å.
The instrument relies on a suite of detectors ranging from fields...
This study involved investigation of an unusual Egyptian votive mummy (IA.2402) of unknown age and provenance, generously loaned by the Australian Institute of Archaeology (AIA) in Melbourne, Australia. The AIA was interested to learn more about the authenticity and contents of the mummified bundle, while preserving the physical integrity of the object and causing as little damage as possible....
A neutron imaging beamline has been set-up at Dhruva research reactor, India. The techniques currently implemented are Neutron Tomography, Neutron Phase Contrast Imaging and Real-Time Neutron Radiography. Combinations of sapphire and bismuth single crystals have been used as filters at the collimator input to reduce the epithermal neutron and gamma contribution respectively. The maximum beam...
The Neutron Radiography Reactor (NRAD) at Idaho National Laboratory (INL) was designed for epithermal neutron radiography for examination of highly-radioactive irradiated nuclear fuel elements. Radioactive samples are remotely lowered into the East and North Radiography Stations (ERS and NRS, respectively), and a rail transfer system remotely positions radiography cassettes into the detector...
The demand for petrochemical feedstock and middle distillate is increasing. Although utilization of heavy oils such as atmospheric or vacuum residue is also necessary, the heavy oils have not been used due to the high viscosity and low quality. Thus, desulfurization and upgrading processes are required to use the heavy oils effectively. A trickle bed reactor, in which a heavy oil and a gas are...
Neutron holography is an imaging technique permitting the three-dimensional reconstruction of the micro-structure of the original sample by using monochrome neutron beam. Neutron holography is able to penetrate deeply into matter with high resolution, and is applicable to the micro-structure investigation of a wide variety of hydrogen-containing compounds and neutron-absorbing isotopes doping...
Gas-liquid two-phase flow appears in nuclear power reactors and is one of the important phenomena for the safety analysis of the reactor. Especially, the transient behavior of the two-phase flow structure is very complicated and has to be understood in detail by experiments. For that purpose, flow measurement method with high temporal resolution is required. Previously, a lot of methods have...
At the RADEN instrument [1], located at beam port 22 of the high-intensity, pulsed neutron source at the Materials and Life Science Experimental Facility at J-PARC in Japan, we take advantage of the accurate measurement of neutron energy by time-of-flight to perform energy-resolved neutron imaging. By analyzing the two-dimensionally resolved, energy-dependent neutron transmission, these...
Neutron imaging has been applied since nearly two decades to visualize the water distribution in operating fuel cells, and has largely contributed to unravel the mysteries of water management in these devices. Two key characteristics make neutron imaging particularly attractive for fuel cell research: the high penetration of neutrons through dense structural materials such as aluminum and...
Lawrence Livermore National Laboratory is developing a high-brightness, quasi-monoenergetic neutron source for fast-neutron imaging. Past and on-going image quality index (IQI) measurements of various objects show that there is great promise for fast-neutron imaging, specifically for imaging structural and material integrity of low-density materials within high density enclosures. ...
As neutron imaging emerges as a complement to current nondestructive testing techniques such as X-Ray imaging, more research is focusing on fast neutron imaging. Fast neutrons offer excellent penetration through heavily shielded materials due to their low probability of collision interactions, however this also makes their detection difficult. This work applies lens-coupled imaging to measure...
To investigate liquid metal flow has critical importance in many industrial applications like metallurgy and Nuclear engineering. However, it is still difficult to measure the liquid metal flow at high temperature at present. Recently ultrasonic velocity measurement becomes one of the important measurement methods in such liquid metal flow, but its applicable temperature range is still limited...
The neutron radiography / tomography / imaging instrument DINGO is operational since October 2014 to support research at ANSTO [1]. DINGO had a high subscription rate from a broad national and international scientific user community and for routine quality control for defense, industrial, cultural heritage and archaeology applications. DINGO provides a useful tool to give a different insight...
We report on the continued development of the ‘GP2’ detector [ 1 ], highlighting a selection of energy resolved measurements and associated methodology. GP2 is a 100k pixel time-of-flight (ToF) neutron camera, which combines a gadolinium converter film and a CMOS (Complementary Metal Oxide Semiconductor) readout sensor [ 2 ]. This paper is separated into three categories; (1) detector...
We have been developing a compact accelerator-based pulsed neutron source at the National Institute of Advanced Industrial Science and Technology (AIST) in Tsukuba, Japan. The main purpose of this neutron source is to analyze structural materials of automobiles and other transportation vehicles nondestructively by means of the high penetration power of neutron beams. We plan to focus on Bragg...
The presented topic is part project PERTINaX (periodic testing by imaging with neutrons in addition to X-rays) which has started in November 2016. The project is funded by the German Federal Ministry of Economic Affairs and Energy (BMWi) under the funding code 1501534 and continues work and research done in the project NISRA (neutron imaging system for radioactive waste analysis) [1].
Aim of...
The increased demand of high-resolution neutron imaging has not been followed by a correspondingly increased availability of high-resolution options, due to the technical challenges and high costs of designing and manufacturing such systems. Neutron flux limitations are also a key factor that hinders the adoption of traditional high resolution solutions.
To overcome this situation and to open...
For the non-destructive characterization of radioactive waste packages for the declaration or verification of their radioactive inventory, well-established passive and active methods are applied. These are mainly based on gamma-spectroscopic emission measurements (segmented gamma scanning), gamma-transmission measurements (e.g. radiography and tomography) using an external Co-60 source or...
While neutron imaging with thermal and cold neutrons has become a standard method at many neutron facilities world-wide, little research has been done on epithermal neutron imaging with electronic detectors. Indirect methods with dysprosium foils and film or imaging plates have been used for the examination of nuclear fuel at Idaho National Laboratory (INL) and other places, but a fully...
This investigation highlights the use of fast neutron radiography (FNR) as a technique to determine the intrinsic properties of dynamic media.
The inherent property of sand, the hydraulic conductivity, is determined using the constant head method. Through the attenuation of the fast neutrons by water, we see the evolution of the water front with time and determine important parameters from...
Standards are required for commercial and quality-controlled processes. All current standards for neutron radiography are intended for use with film, but there are currently no standards that technically apply to modern digital neutron radiography systems. Trends in the neutron imaging community show a move towards digital systems that have many advantages compared to traditional film neutron...
In 1948 Dennis Gabor introduced the technique of “holography” where an image of an object is reconstructed by using a far-field electron micrograph of the object as a transmission mask for visible light. The development of coherent laser light sources in the 1960s vitalized the field to a degree that optical security holograms are now a standard feature of many paper currencies, credit cards,...
In this talk I will present our work on developing far-field moire neutron interferometry at the National Institute of Standards and Technology's Center for Neutron Research. We have successfully built a two phase-grating moire interferometer and employed it for phase contrast imaging. This novel technique allows for broad wavelength acceptance and relaxed requirements related to fabrication...
Neutron imaging provides outstanding sensitivity to light elements, e.g. high contrasts between hydrogen containing materials and metals. The neutron imaging facility NECTAR at MLZ regularly uses a fission neutron spectrum with a mean energy of 1.9MeV. These high energy neutrons allow insight in large objects of up to several ten centimeters with a high selective contrast for hydrogen. In...
Neutron radiography which images interactions within the nucleus of atoms, rather than between electrons like X-ray (1), can identify the strongly interacting hydrogen in water molecules, and can be used to determine hydraulic behavior in soils and plants. The first of a series of neutron imaging (NI) is able to determine the water content and morphology of roots planted in pots embedded in...
Neutron imaging detectors based on neutron-sensitive microchannel plates (MCPs) were constructed and tested at beamlines of thermal and cold neutrons. The MCPs are made of a glass mixture containing enriched boron and natural gadolinium, which makes the bulk of the MCP an efficient neutron converter. Contrary to the neutron-sensitive scintillator screens normally used in neutron imaging,...
The Los Alamos National Laboratory Advanced Imaging Team is designing two novel neutron and gamma imaging systems being built to image inertial confinement fusion processes at the National Ignition Facility. While the immediate application of the design is in fusion diagnostics, the lessons learned will be transferable to any fast-gated radiographic imaging system. The stringent requirements...
The high resolution neutron imaging instrument (‘Neutron Microscope’) at the Paul Scherrer Institut (PSI) allows for neutron imaging down to 5 micrometres spatial resolution (Trtik & Lehmann, 2016). The transferrable nature of the instrument allows for its use at different beamlines of SINQ (namely at ICON, POLDI, BOA) and also at other neutron sources. The recent advances in both the spatial...
Bragg-edge residual strain tomography has been achieved for the first time in general two-dimensional systems. This approach allows the reconstruction of detailed stress and strain distributions within polycrystalline solids from sets of Bragg-edge transmission strain images.
In contrast with traditional scalar tomography, this problem is ill-posed due to an issue surrounding the...
In recent years, the rapid development of neutron imaging methods by the operators of neutron sources and their users has triggered a tremendous improvement of both spatial and time resolution and furthermore the implementation of techniques that utilise new contrast mechanisms. Such developments have now become standard methods for many research fields in materials science. The range of...
Additive manufacturing (3D printing) provides a new freedom in materials design. In our recent research work, metallic and ceramic structures have been prepared by different 3D printing techniques including selective laser melting, extrusion and digital light projection. X-ray CT and Neutron CT has been used for structural examination. In combination of wet-chemical processes (thermal...
Cements (mortars and concrete) are, despite their wide spread use, susceptible to chemical attack and weathering. Cements are particularly susceptible to acid attack, which leaches Ca and Al from the cement paste and lowers paste pH, thereby weakening the cement matrix. Similarly, sulfate in waters can also interact with the cement matrix [1,2], where several reactions occur. Firstly,...
Imaging with polarized neutrons has in recent years increasingly gathered interest due to its ability to visualize bulk magnetic properties and magnetic fields in 2D and 3D. Currently the spatial resolution of typical setups is limited to ~500µm by the space consumed by the polarization analyzer which needs to be placed between sample and detector. This increases the minimum sample to detector...
Zirconium based alloys are widely used in the nuclear industry, mostly as tubes and claddings operating in high-pressure water at temperatures between 250°C-350°C. Hydrogen (H) or deuterium (D) ingress due to waterside corrosion, and subsequently precipitates as a brittle hydride phase. Degradation mechanisms involve the accumulation of these brittle hydrides at cold spots or crack tips, as a...
We are reporting an in-operando study of time-resolved neutron imaging on cycled Li-ion batteries to analyze the phase changes during lithiation and delithiation.
Rechargeable lithium-ion (Li-ion) batteries are used to power up our daily portable appliances. They are electrochemical cells consisting of a positive electrode separated from a negative electrode, in electrolyte solution, which...
Metallurgical coke is an important raw material used in the ironmaking blast furnace as a reducing agent and structural component of the furnace burden. One of the factors effecting coke performance is porosity. Traditional methods of determining coke porosity involve metallurgical techniques that assess two dimensional cross-sections of a given coke. In this work we discuss the limitations in...
Magnetic field induced neutron phase contrast imaging with grating interferometry
Magnetism has always been in the spotlight and neutrons have played an essential role
in understanding this physical phenomena due to their intrinsic magnetic moment. Polarized
neutron imaging and the grating interferometer (nGI) technique have been established as
powerful means [1; 2] for investigating...
Polycrystalline materials undergoing thermal or mechanical loading suffer deformations and damage which can modify their grain size, orientation and texture. To obtain multigrain information from crystalline samples, 3D grain mapping is performed using x-ray diffraction at synchrotron radiation sources. However, the scope of this technique is limited due to the lack of penetration power inside...
Contrast agents for neutron radiography have been demonstrated for industrial applications; however, quantitative evaluations of these contrast agents are scarce in the published literature. This project will develop a quantitative tool to determine crack extent using processed neutron radiographs. This quantitative tool will be valuable for analyzing cracks in irradiated materials such as...
Introduction
Quantitative neutron imaging is hampered by different sources of nonlinearity: polyenergetic beam, beam hardening, detector uneven light distribution and neutron scattering. The correction of these effects is necessary to approximate the log-attenuation as a linear function of the sample density. We focus here on the scattering component, caused by the neutron interaction with...
The synergy imaging is an imaging technique which obtains a nuclide distribution image with higher spatial resolution using the differences between cross sections of neutron and X-ray [1]. The concept of the synergy imaging is developed from the image alignment technique using the mutual information (MI). In our previous computer simulation study, the procedure extended to the...
The NIST Neutron and X-ray Tomography (NeXT) system provides simultaneous complimentary multimodal information for the characterization of materials. Neutrons and X-rays provide complementary non-destructive probes due to the contrast differences that arise from the differences in interaction with matter for the two modes. NIST’s NeXT system was initially commissioned in 2015 and has been...
A thermal neutron imaging facility and a cold neutron imaging facility are under construction at China Advanced Research Reactor (CARR). At present, some main components, such as collimator, sample table, detection system, etal have been finished, and the others are under construction. The thermal neutron imaging facility will be operated in two modes: high intensity and high resolution...
The ORNL HFIR CG-1D neutron tomography beamline will be the future site of grating-based interferometry/tomography. This presentation will give a work-in-progress report describing construction activities and results commencing in late spring, 2018.
Two interferometer designs will be developed: Talbot-Lau and far-field. Talbot-Lau has the advantage of considerable operational experience at...
Soreq Applied Research Accelerator Facility (SARAF) will be a user facility for basic and applied nuclear physics, upon expected completion at the beginning of the next decade. SARAF is based on a 40 MeV, 5 mA CW proton/deuteron superconducting linear accelerator. A high intensity accelerator-based Thermal Neutron Source (TNS) will be a major application of SARAF within its higher goal to...
Abstract
Recently, the Jordan Research and Training Reactor (JRTR) has officially got its operating license. The JRTR, 5 MWt, upgradable to 10 MWt, and neutron fluxes of orders of 10^14 n/cm2.sec, has started its activities to provide multi-purpose services according to the potential utilization plans. This paper discusses one of the most important and primary instruments in regards to the...
We have performed extensive testing and qualification of different commercial fast neutron scintillator screens in camera-based imaging detectors. These include BC400 organic scintillator from St. Gobain and ZnS(Cu) inorganic scintillator from RC Tritec AG. Furthermore, we have developed simple and inexpensive ZnS-based fast neutron imaging screens and their performance have been tested and...
Research reactors have been used as good neutron sources for neutron radiography systems during last decades. Although these reactors have many disadvantages, such as lack of portability, high cost and high waste production, these sources can provide high and stable neutron flux and also have some equipments such as beam tubes in order to extract neutron beams through the biological shield. In...
Neutron grating interferometry (nGI) is a relatively new neutron imaging technique which is the
adaption of a Talbot-Lau Interferometer for neutrons [1]. It simultaneously delivers information
about the transmission (TI), phase shift (DPC) and the scattering (DFI) inside a sample [1].
In particular the DFI has generated high interest, due to its ultra-small-angle neutron scattering
(USANS)...
The usage of neutron beams for non-destructive material studies has a long tradition since suitable sources were available. Meanwhile, neutron imaging has been developed towards a routine method at many places with basic (radiography, tomography) and more advanced (grating interferometry, polarized and diffractive imaging, data fusion) features. This development was only possible after the...
